Safety system for swinging elevator doors.



G S WILLIAMSON SAFETY SYSTEM ronswmems ELEVATOR ooons.

APPLICATION FILED DEC. 21.19114 7 v I Patented July 2 SHEETS-S I G. S'. WILL|AMSON.. SAFETY svsma ron swmeme ELEVATOR nooks.

APPLICATION FILED DEC. 2I. IQIIJ Patented July 30, 1918. r

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Specification of Letters Patent;

Application filed December 21,1917. Serial No. 208,284} a To all whom z't may concern: 1 g

Be it known that I, GLENN S. WIL IAM arm, a citizen of the United States, residing in the city, county, and State of NewYork, have invented certain new and useful Improvements in Safety Systems for Swinging Elevator-Doors, of which the following is a specification. 'i v The invention relates to a formof elevator safety system wherein a train of mechanism on the car, operated by the car operator. when the car is at a landing and the controller in neutral position, unlocks the landing. door lock throughthe move-. ment of an externalshoe orcontact piece while simultaneously locking the controller through a suitable device'on the car, the

car mechanism being retained in actuated. condition by means associated with the door look, so that the controller can not bemoved to start the car, while the door is unlocked. A particularpurpose ofthe presentinvention has been to devise a combination of simple, effective and convenient character, which can be used with swinging doors with the look below the landing level, this being a type of construction which is more desir able than an overheadinstallation but hitherto difficult .of application to swinging doors; The desired end is now secured by certain novel features of construction, relation and operation, including preferably a specifically novel form of locking and detent mechanism on the shaft face; and the combination with locking mechanism so 10- cated of a cooperative member on the swing ing door, which normally projects beyond the edge of the door and is withdrawable within the confines thereof preparatory to the opening of the door, such withdrawal.

of the member being normally prevented by the locking mechanism. The projectable portion of this member .is offset, inorder to enter the shaft; and, in order toavoid obstruction to persons or freight when. the member is withdrawn, its mounting is such as to permit of a compound movement, so that the offset portion can be turned to lie substantially flat against the door.

The preferred embodiment of the invention will now be briefly described, reference being had to the accompanying drawings, wherein:

Figure 1 is a fragmentary perspective view showing; a portion of theinterior of an; elevator car at; a landing withan out-i wardly swinging. landing, door. partly open' andthe car controller locked in neutral position;

Fig. 2 is a fragmentary perspective view of the door and shaft face with'the door closed and locked; 7

Fig. 3. is a face View of the .incasedshaft mechanism andfa portion of thedoor member, the condition illustrated being the locked condition q I s Fig; 4 is a vertical section; on the line. H of Fig.3, 1

Fig. 5.,isaview similar to Fig.3 withthe cover plate removed, showing the'parts in the condition whichtheyassume when the door is open and the" car shoe, a portion of which is shown, l1eld by-th 'd t m;

I 'Figs. 6 and 7 are-front-and .sitleelevm:

tions of the door. m,ember, .whi ch .in the pre-,

ferred; form illustrated is a .vertically slidr ing bolt or rod and 1 g Fig. 8 is a cross-section Of Fig. 6; p

lvis a swinging landing door of'thej singles on line 0mm: s. WI LIAMSON, or Nnw'roRK, N;- ,,:A s 1cNbs i'ro. snuniioe emu-res; 7

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Patented July 30, 191.8.- Y

leaved variety,hinged at one side to swing is outwardly away from the shaft. f Inaccordance with the invention the door is provided at its-inner, side with-a raisable member 2, the lower portion-3 of which is offset or doubly right-angled, as shown, in order that it may extend over-.the sill and. downward for adistance in front ofthe shaft face. 7 'The specific. form 'and :the mounting of such membermaybe varied, but in the construction herein preferred'it consists of a vertically=sliding 'rod' guided in bearings 4 and 5 at theends of a slotted l plate 7 on the door and provided at its upper end with axlaterally-projectinghandle .6.

A pin 8 projecting from the bolt and'trav bolt from turning when in its lower or lock-j ing position, and guides its lower end in relation to the locking mechanism, preseling in the slot 9 of this plate, keeps the ently to be described, whe n'it is being pushed downward.- A lateral passage 10j-at. the upper end of this slot permits the bolt to be turned when in its uppermost position, and also holds it against dropping... In this condition the offset end 3 is raised above the floor level, and folded back close to the door,

The shaft mechanism is mounted a frame or case 11 having perforated lu'" 12 whereby it isattached the shaftwal cover plate 13 leaves one side of the front of this case open to admit the car shoe 1 1, the top and bottom walls being also recessed for this purpose, as shown at 15. The mechanism comprises instrumentalities for look ing the landing door and for retaining the can. mechanism, hereinafter described, in actuated condition. The form and arrangement of these instrumentalities may be varied in different cases, but the construction shown is the one here preferred. A doorlocking member 16 is pivoted at 17 upon a horizontal axis parallel with the face of the shaft, in the lower part of the case beneath the cover plate, thence extending upward and bearing two reversely-directed lateral arms 18 and 19. Of these the arm 18 is a latch element, having a beveled upper face 20 and a square lower face 21 to cooperate with upwardly-facing locking shoulders 22 on the bolt portion? The other arm 19 is a contact element extending into the open part of the case in position to be encountered by the car shoe when the latter is thrust forward.

The top wall of the case has an aperture 23 with a flaring mouth, through which the said bolt portion 3 asses downward into the 4 interior to'cooperate with the locking arm 13.

In line with the aperture 23 below said arm are bores or barrels 2a, 25 for the further guiding of the bolt and to hold a verticallysliding plunger 26. This plunger is urged upward by. an expansion spring .27, and is normally depressed by the bolt, which contacts with its upper end. The side of the plunger is cut away or slabbed off at 28 for the attachment of one arm 29 of a bellcrank member 30, which is pivoted at 31 on a horizontal axis perpendicular to the face of the shaft. This bell-crank member is a detent device, its other arm 32 extending upward from the pivot and bearing a laterallyprojecting nose 33, which is constructed and arranged to engage behind the car shoe when the latter is projected so as to press the contact arm 19 towardthe back wall of the case. The connection 34 between the bellcrank arm 29 and the plunger is of the pin and slot variety, allowing for the difference in movement of the parts. A spring 35 coiled about the pivot portion of the locking member urges this member away from the back wall and consequently restores it to normal position when the ear shoe is retracted.

The ear mechanism which terminates in the shoe 14 is preferably of a form made known by another, consisting essentially of a transverse rock-shaft 36 journaled in brackets 37 beneath the car floor an d bearing a plurality of crank arms 38, 39 and 10, with the first of which a pedal a1 is connected, ex-

, v. tending through the floor of the car with its tread portion convenient to the foot. of

the operator, a fore and aft slide bar 12 hearing the shoe being connected with the arm 39, and a vertically-extending controller-locking rod $3 with the arm 40. The upper end of this rod is adapted to enter a notch ea in an arc segment 45 on the base of the ontroller lever 16, the arrangement being such that the curved edge of said segment bars movement of the rod, and therefore of the shoe in all positions of the controller except the neutral midposition, at which the rod may enter the'notch, thus locking the controller and permitting the projection of the shoe. The car mechanism is self-restoring when the shoe is released by the detent, whichmay be accomplished by the weight of the rod 43, or by a special counterweight or spring, if desired.

The operation will be briefly summarized. Under the normal condition the door cannot be opened because of the bolt portion 3 projecting downward into the shaft, and this member cannot be raised because it is locked by the engagement of the member 16 with one of its shoulders 22. To open the door the operator must first bring the car to rest approximately at the landing-by placing the controller in mid-position. He then steps on the pedal, thus operating the controller lock and projecting the shoe. This presses the locking member 16 backward against the action of its spring, thus releasing the door member or bolt 2, which may be raised. Immediately upon such upward movement of the bolt, the plunger 26 rises under the pressure of its spring, swinging the bell-crank detent 30 about its pivot and causing its nose to enter'behind the shoe, which is thus held actuated as long as the said door member is raised and the door is open, and until the door is closed and its member returned to downward-projecting position. The controller lock, being connected with the shoe, is also held throughout the same period, so as to prevent the controller being moved to start the car. -When the door member is finally restored to its normal position, the plunger 26 is moved downward, the detent 30 is rocked back to release the car shoe, and the car mechanism then returns to normal condition, freeing the controller, so that the car may then leave the landing. The duplication of the shoulders or notches 22 in the bolt is for additional safety. The manner of raising and lowering and turning the door member has already been described.

WVhat I claim as new and desire to secure by Letters Patent, is:

1. In an elevator safety system, a swinging landing door, a member projectable beyond the edge of the door and withdrawable within the confintes thereof, and locking means in the shaft for preventing such withdrawal of the door member, in combination with operatonactnated doorarulocking and controller-locking mechanism. on the car terminating in a'contact shoe cooperative withsaid locking means in the shaft; and

means associated with saidlockin'g means for holding the car mechanism in actuated condition. 2. In, an elevator safety system, the combination-of a swinging landing door, a member movably mounted thereon soas to be projectable downward into the shaft andwithdrawable above the floor level, and locking means in the shaft below the door for preventing such withdrawal of the door member, in combination with operator-actuated member, operator-actuated door-unlocking and controller-locking mechanism on the car, terminating in a contact shoe'for disengaging said locking means from thedoor member, and means associated with said locking means in the shaft and controlled by the withdrawal and projection of the movable door member before the opening and after the closing of the door, respectively, for retaining the car mechanism in actuated condition when said member is withdrawn-and for freeing it when the member is projected. v

4. In an elevator safety system, the combinat'mn of a swinging landing door, a movable member thereon constructed toproject beyond the edge of the door and displaceable from such position to a position within the confines of the door above, mechanism on the face of the shaft comprising locking and detent devices, the former normally engaging and preventing such'displacement ofthe movable member relatively to the door, the detent device'being normally pressed out of operative position by said door member and moving automatically when said member is displaced before the opening of the door, and operator-actuated door-unlocking and controller-locking mechanism on the car terminating in a contact shoe adapted to disengage said locking device from the door member and itself to be engaged by said detent device.

5. In an elevator safety system, the combination of a swinging landing door, operator-actuated means on the car including a door-unlocking shoe and means coordinated therewith for rendering the car controller inoperat ve, mechanism on the face of the shaft below thegfloor leveliincluding .doorand a; -movable :mfimber on the door having anoffs'et angled portion to extend over the sill and downward into the shaft into en gagement with the mechanism therein',:'an'd permitting the a mounting for saidmember same tobe moved upward and turned side wise to lie substantially flat against the door clear of the landing. a V 6. Inan elevator; safety system, the combination of a swinging landing door, operator-actuated means on the car including a contact shoe and therewith coordinated means for rendering the car'controllerjinoperative, mechanism on the face of the shaft below the floor level cooperative with said shoe and including door-locking and -car-mechanism-retaining instrumentalities, and a membermountedon the doorfor vertical sliding and lateral turning movements and hav'inganofiset lower portionto coop erate with the shaft mechanism.

7. In anelevator safety system, the coinbi nation of a swinging landing door, operatoractuated means on the car including a doorunlocking shoe and means coordinated there-' with vfor renderingthe car controller in V locking-and shoe-retaininginstrumentalities,

operative, mechanism onthe face of the.

shaft below the floor leveltincluding door locking and shoe-retaining 7 =instrumentali-' ties, and a vertieally sliding andlaterallyturning bolt on the landing door having its lower portion offset and provided with an upward-facing locking shoulder to cooperate with the mechanism on the face of the shaft;

8. In an elevatorsafety system, the combi nation of a swinging landing'door, operatoractuated means on the car including a doorunlockingshoe and means coordinated there with for rendering the car controller 'in operative, 'mechanism on the face of -the shaft below thefloor level including' doorlocking and shoe-retaining instrumentalities, I a vertically-sliding and laterally-turm ing bolt on thelanding door having itslower portion offset-and provided with an upward facinglocking shoulderto cooperate with the mechanism on the face of the shaft, and means for preventing turning of said boltas it is moved downward into engagement with the shaft mechanism. f a

9. In an elevator safety systeimthe combination of a swinging landing door, operator-actuated means 'on the car including a door-unlocking shoe and means coordinated therewith for rendering the car controller inoperative, mechanism on the face of the shaft below the floor level including door locking and shoeretaining instrumentalities, a vertically sliding and laterally-turning bolt on the landing door havmg its lower portion offset and provided with an upward-facing locking shoulder to cooperate with the mechanism on the face of the shaft, and'means for guiding saidbolt in relation to the shaft mechanism and for holding the same in its elevated turned position. I 7

10. In an elevator safety system, the combination of a swinging landing door,a vertically-sliding bolt thereon having an offset angled lower portion provided with an upward-facing locking shoulder, a locking member on the face of the shaft cooperative therewith, a detent device normally depressed by said bolt and tending to move when the bolt is raised, and operator-actuated door-unlocking and controller-locking mechanism on the car, terminating in a contact shoe adapted to disengage said looking device and to be held by the detent device.

11. In an elevator safety system, the com bination with-a swinging landing door, a vertically-sliding bolt thereon, its lower portion adapted to project downward into the shaft and provided with an upward-facing locking shoulder, and operator-actuated door-unlocking and controller-locking mech anism on the car, terminating in a contact shoe, of means'on the face of the shaft be low the floor level cooperative on the one hand with the ear shoe and on the otherhand with the door bolt, said means comprising a locking member mounted on a horizontal pivot parallel with thefaee of the shaft and thence extending upward with its upper portion constructed to engage the locking shoulder of the doorbolt, and a detent normally depressed by the door bolt and adapted to engage the car shoe.

12. In an elevator safety system, the combination with a swinging landing door, a vertically-sliding bolt thereon, its lower por tion adapted to project downward into the shaft'and provided with an upward-facing. locking shoulder, and operator-actuated door-unlocking and controller-locking mechanism on the ear, terminating in a contact shoe, of means on the face of the shaft below the floor level cooperative on, the one hand with the car shoe and on the other hand with the door bolt, said means comprising a locking member mounted on a horizontal pivot parallel with the face of the shaft and thence extending upward with one lateral arm constructed to engage the Copies of this patent maybe obtained for locking'shoulder of'thc door bolt and a reversely-extending arm to be contacted bythe car shoe, and a detent normally depressed by the door bolt and adapted to engage the car shoe.

13. In an elevator safety system, the com shoe, of means on the face of the shaft be-' low the floor level cooperative on the one hand with the car shoe and on the other hand with the door bolt, said means comprising a locking member mounted on a horizontal'pivot parallel with the face of the shaft and thence extending upward with its upper portion constructed to engage the locking shoulder of the door bolt, a vertical spring-pressed plunger normally depressed by the door bolt, and a pivoted detent mem= ber connected withsaid plunger and adapted to engage and hold the car shoe when the bolt is raised.

.14. In an elevator safety system, the combination with a swinging landing door, a.

vertically-sliding bolt thereon, its lower portlon adapted to project downward into the shaft and provided with an upward facing. locking shoulder, and operator-ac tuated' door-unlocking and controller-locking mechanism on the car, terminating ina contact shoe, ofmeans on the face of the shaftbelow the floor level cooperative on the one handwith the car shoe and on the other hand with the door bolt, said means comprising a locking member operable by the car shoe and constructed to engage the locking shoulder on the door bolt, a vertical spring-pressed plunger normally depressed by the door bolt, and a detent connected with saidplunger and adapted to engage and hold'the car shoe when the bolt is raised. Intestimony whereof, I have signed my name. to this specification, in the presence of two subscribing witnesses.

p v GLENN S. WILLIAMSON.

WVitnesses:

ED'rrI-IM. CLARK, HELEN I. GRAHAM.

five cents each; by addressing the Commissioner of fatents, Washington, D. G. 

